I was talking to our account manager in GW about new tanks for IG. The indication is that we'll see the news stuff around June or July. The Leman Russ will have enough plastic parts to make several of the variants if not all. Hellounds will get the same treatment. You can see what the new 'hounds will look like by looking in the codex.
Yes, there is more SM stuff on the way. As soon as I am told about it from GW the sooner I'll post it.
In the meantime, any suggestions on what kind of combo deals that we could put together? Comment if ya got one!