I agree with Wipqozn that future patches shouldn't be on-topic, but that's a separate issue.
I think there's material differences between questions like the two listed and other patch-related questions: the former asks a general question about how the patch will affect the game as a whole, while the latter asks about a specific change and how it will affect a specific issue. If you'll forgive my Minecraft bias, the latter would consist of questions like:
But even StarCraft questions like:
These questions, I think, are uncontroversially on-topic: wow, starcraft-2, and minecraft get these questions all the time and they're pretty important for understanding the game. Games that have perpetual updates are going to ellicit questions about specific issues once new changes are rolled out.
The questions you listed are a bit more tricky: they're not too localized (if they were, all patch-related questions should be closed as well), and they're not polls: they're not asking "What's your favorite feature from 1.11?" or similar.
The problem I have with those questions is the topic scope: I don't know what aspects of the changes to those units is going to affect your gameplay. Something I might find relatively minor might be a huge deal for your play-style. I effectively have to read your mind to guess what a correct answer to the question would be.
And because of that, they're invitations to create monolithic questions about the patch. But we should be encouraging multiple questions about the specific changes and how they relate to specific problems.
That is, patches are an excellent opportunity to show the true value of Gaming.SE: that when you have a question about a change that affects you, instead of trying to participate in that 300 page thread on Battle.net, ask it here and get a custom answer about the specific issue you're having.
So a better way to reword the StarCraft II question might be, "Given change X to unit Y, in patch 1.11, how do I pull off strategy Z?" where X, Y, and Z are very specific things. That'd turn a pretty general question about all the things one might care about related to a unit to a specific question of the form we generally like.