Not sure if anybody has mentioned this already but I believe Neji is not entirely gone or "dead dead". When a character in the manga dies, there is formula that the author follows. First the character becomes the focal point in the current story arc or for a few chapters. Then right before the character dies, a flashback of his/her life takes place right before death.
Examples;
-Kisame. When he got "decapited" by the Bee and the Raikage. There was not flashback nothing. Then when he officially dies, you see the flashback of him and Itachi. Then performs the most hardcore epic form of suicide in the known ninja universe.
-Danzo. Right before his death, we see a flashback of him and the third hokage in the middle of a battle. Where he loses the title of hokage to sarutobi
-Konan. Right before her death we see a flashback of her time training under Jiraiya with Yahiko and Nagato
Point being, Neji death was to abrupt. When this happen to Kakashi during the invasion of Konoha arc. His death was as well abrupt and didnt follow the formula mentioned above and lo and behold; Kakashi is with us now. So I believe this will be the same case with Neji. (probably be revived by Obito turning good and using the resurrection technique pain used earlier in the manga). So for now, RIP Neji (soon to be "welcome back")