i'd like to see a source for your information, please, this would be a terrible decision on their part, pros would be mad, newbies would be mad, everyone would be mad, it'd be like blizzard saying they're removing death knights from wow cause people complained.
it's their game, they should not remove content that the rest of the public likes because 10% of the people WHINE like babies about not being able to win easily. UGH. if blizzard continues to be towed around by the nose by whiners, they are going to fail as a company.
Blizzard's not removing units people deem 'OP' and 'UP', Blizzard is planning to either majorly overhall certain units or get rid of them altogether, on a basis of viability and usefullness, not favor.
For example, Blizzard has expressed that Overseers aren't quite 'sexy enough', or something along those lines. They mentionned disastisfaction that immortals didn't fill their purpose as a tank, and ended up as a powerhouse. They wish the reaper could have been balanced better for the metagame, and it seems likely the reaper is getting an overhaul.
There might be other examples, but it seems HotS is going to have a very different metagame than WoL. You should be happy though. It's possible Protoss's metagame could shift away from sentries and colossi, and given the chance to be extremely offensive early game, quite the opposite of current TvP. Zerg is almost certainly getting a burrowed attacker, which could bring back even more of zerg's immense map control powers from BW.
I'm excited Blizzard has realized to truly correct the mistakes of WoL, some stuff will have to be redone. I think HotS will have a much, MUCH bigger impact on SC2 than BW did to the orignal Starcraft.