I doubt they're being deliberately misleading. I mean why bother?
Honestly I'm mostly just confused as to why this is being introduced as a patch and not DLC (free or paid) along the lines of FireWalker and the ME3 extended cut. To my way of thinking, a patch is meant to either fix something that's already in place but not functioning as intended (broken quests, plot triggers, engine stability etc.), or to add minor functionality upgrades in response to feedback (key mapping walk for example.)
This feels a lot more like a content update as it'll include a new area (albeit a relatively small one) with new art assets, voice over (at least one hopes, as Xenon was hilarious!) as well as new shops and a storage chest.
I think the clue to all this may be tied to the way they're beta testing the patch in this way (i.e., not in-house), which combined with some of the persistent problems as yet unresolved by the first four patches to me, leads me to think that they're genuinely struggling to get frostbite to behave itself.
I say that also partly because from what I've read, BF4 also suffers from similar problems well over a year after launch. It's clearly a powerful engine, but it seems to have some very deep rooted stability issues.