Thought it was a good idea to post this here so that it doesn't get lost in the NDS.
The symbols on their hands are the Chiba Mon which is the clan symbol of the Ootsutsukis.
Kawaki
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Boruto
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Toneri
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Chiba Mon Symbol in real life
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At most I can guess is that Boruto and Kawaki are using some kind of Ootsutsuki Techniques based on the Chiba Mon Connection.
What is even more interesting is that Hagoromo's symbol is the In-Yo, an incomplete Chiba Mon.
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You can find more on the Chiba Mon here :You must be registered for see links
I don't know if you saw this yet but OD translated a bit from the chapter 1 recap.
It might help your theory on the crests崩れた里、火影岩…平和となったハ�� �の木ノ葉隠れの里で戦う、ボルトと� ��カワキ」と呼ばれる人物。2人とも 、身体に共通する紋章があるようだ�� �、一体…?
In a crumbled village, at the Hokage Monument...They're fighting in Konohagakure Village, which is supposed to be peaceful: It's Boruto and a character referred to as 'Kawaki'. The both of them seem to have a common 'crest'//'coat of arms' on their bodies, so what happened...?
[T/N]
***紋章= Crest, Coat of Arms, Emblem, etc
(I thought this intro page worded the matching tattoo's in an intriguing way, that's all. Didn't mention it as a type of 'seal' like I expected.)
Source/Translator: OrganicDinosaur
This reminds me of a part of Rabbit Teth's theory :-
Their Tattoos are oddly behaving just like how Cursed Seal State 1 behaves.Which leads me to a new idea. What if the Cursed Seal is actually a way of activating Ootsutuki heritage. When normal people are infected by the Cursed Seal it simply kills them. When those with Ootsutsuki blood are afflicted their Ootsutsuki traits become exagerated and they grow horns, their skin changes colour and they take on the general appearance of a Demon. Only 10% of people hit with Orochimaru’s Cursed Seal actually survive – normal people just die:
Ootsutsuki Descendants?You must be registered for see images
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When the Cursed Seal stops spreading when it goes inactive, in Stage 1, the marks take a Black Color.
Sasuke - Cursed Seal Inactive - Black Marks.
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Kawaki - Tattoo Inactive - Black Marks.
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Boruto - Tattoo Inactive - Black Marks.
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When the Cursed seal is activated, it's color changes.
For most Cursed Seals, it takes on an Orange Color when activated. Sasuke's Cursed Seal takes on an Orange Color when activated.
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Kawaki's Tattoo takes on a Red Color when activated. Red shows the presence of/Represents Yang Chakra = Yang Kuruma Jin ?
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Boruto's Tattoo takes on a Blue Color when activated, perhaps the Blue color denotes the Presence of Yin Kuruma as Blue represents Yin ?
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Coming back to the Crests/Emblems, They generally refer to symbols on the skin.
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Some Tattoos have a centerpiece design. For example, in this Tattoo, the Centerpiece is the Lion. The Lion would be the Crest/Emblem whereas the surrounding area would be a design (Flames, swords, etc). I would say Kishi is focusing on such type of Tattoos in his story.
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I think this refers to the Chiba Mon Crest/Emblem/Coat of Arms.
Boruto's Crest
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Kawaki's Crest
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An amazing detail that most people may not have noticed is that the Cursed Seals also have an Emblem/Crest/coat of arms.
Sasuke's Cursed Seal of Heaven Emblem
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Kimimaro's Cursed Seal of Earth Emblem
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The Emblems of the Curse Seal and Boruto and Kawaki's Tattoos seems to be the source of their Superhuman powers.
The similar behavioral patterns and the emblems pretty much connect the Curse Seal and the Tattoos. To me it seems like a New Generation of Curse Seals (Boruto and Kawaki) which are compatible with the powers of a Bijuu (We never saw a Jin get the Curse Seal after all).
A further link to the tattoos can be established with Orochimaru which hints that Orochimaru gave them the seals. The Snake Sage Mode Eye mark (Similar to Frog Sage mode mark on the eyes) is actually this :-
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This is actually the same marks that are on Orochimaru's eyes (Orochimaru has Snake Sage Mode, massive evidence has been given by the manga and Fourth Databook).
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Look at Kawaki's eye and you will see the snake mark.
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Same goes to Boruto's Byakugan.
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Just goes to show the Snake's influence. :sdo: