We got the first wave of single SS packs here, and I thought they did fairly well, so I'd be surprised if we didn't get this second wave as well.
You aren't mistaken about thinking that they were already released, as they were out in Asia mid December... so if we are going to get them, I would have thought they would be out soon.
And yes, "official announcement" doesn't mean that the toys aren't yet released, as most of today's reveals were already out somewhere in the world (the RED toys, the Vintage BW toys, the SS Spike toy, and those Buzzworthy toys)... and most of the rest were already seen as official images (the Legacy toys), were officially revealed by Hasbro previously (Arcee), or images leaked (Junkheap). That left only two toys to actually be revealed, Sludge and Ironhide.