As I said in that topic yesterday, I lot of people think Earth and lightning make explosion and Lightning and fire make blaze. These are possible but certainly not confirmed. I'd say explosion has a much better chance of becoming true, but somehow I doubt that blase is fire and lightning.
As for Earth and wind, its likely steel release, since it was originated in the movie that Storm release was taken from. However, I don't see swift release being fire and lightning as a few have speculated.
To add a little more detail, there are multiple categories of confirmation for these KG's. First is obviously the ones that have been 100% confirmed in manga (these are obvious). Next are the ones that can be well established based on which villages use them. This category included Scorch and Magnet. Scorch obviously uses fire and is used by a sand shinobi, sand = wind. Magnet was used by sand shinobi (wind) and cloud shinobi (lightning). Next are ones that have less evidence and are primarily speculated about considering 1 or 2 less obvious cases. This includes explosion, which is confirmed as using earth but have no other real evidence whether it includes lightning or wind, and blaze which is not confirmed as a KG but is used by the only real lighting + fire shinobi we know of. Than there is the flat unknown, which most people consider to be wind + earth since they think explosion is not likely that combination.