The hub is going to celebrate 30 years by showing G1, Prime, and Rescue Bots in July I believe. then there gonna show a sneak peak of Robots in Disguise.
G1 is the first thing in the list in OP's message, how much G1 do you need? Also, the Robots in Disguise they're talking about, for others, is the new series that's coming up, the next cartoon. Not the import of Car Robots that's not likely to see a DVD release, sadly.
GLARGH!!! Hadn't considered this affecting RID's chances of a proper U.S. release. But yeah, not that there seemed to be much chance of it happening as it is but hey. The Shout Factory sets seem to be selling as long as they don't over-manufacture them so who knows? I'm actually wondering if dvd's will be a thing of the past when the time comes for this new series to get out there...