We've known that Ultimate is getting dropped for weeks now, due to the split community with/against GT.Call me crazy, but I don't think Ultimate is getting updated to 1.5. Ultimate was already toeing the line very hard in trying to have something for everyone, but that's not going to be possible to keep up thanks to all the GT changes in 1.5. Offering two modpacks that each offer something from Ultimate is the only way to go from here. Unleashed is pretty much the "If you like cool mods, have a bunch of them!" modpack while Unhinged is the "Ever scream at your monitor over how embarrassingly overpowered wooden planks and stone tools are?" modpack.
That means we are missing a modpack with GT I thought dw20 would have no gt and unleashed would have it.To quickly answer a couple of questions. Ultimate is a locked pack and will not be updated as things stand (without redpower it is very difficult to update these packs). With regards to microblocks, we are waiting on a different version. As to worlds updating from the existing packs, the 152ngt pack worlds should work with the unleashed pack but there are some differences. The 152WGT pack will no be update beyond what it is now.