[Abhishek R]

This has been posted before by someone else on my team, but I wanted to bring it up again since there seems to be a lot of hype around the "increased alliances" theories...

From the administrative manual (Section 5.1.2 I believe) which has been released for 2015 already:

The manual talks about Bag and Tag, so they are keeping that. It also talks about how Practice Matches are assigned to teams and how it must be divisible by 6 before giving free practice matches, which basically confirms 6 robots on the field.

Obviously, FIRST could have made a mistake in the manual or be hiding things only to give us an updated version later. I don't really know how solidified these administrative manuals are.