GHC 7.10.3 will be released in early November 2015. We will do so if (but only if!) we have documented cases of "show-stoppers" in 7.10.2. Namely, cases from users where
You are unable to use 7.10.2 because of some bug
There is no reasonable workaround, so you are truly stuck
We know how to fix it
The fix is not too disruptive; i.e. does not risk introducing a raft of new bugs
So please tell us if your problem falls in to this category, saying a bit about why it is important to you, and why you can't work around it. It's worth attaching the details to the relevant ticket, add it to the manual list just below, and send a heads-up email to ghc-devs to draw attention to it.
Here's a list of the tickets that appear to fall into this show-stopping category: