Rogue Hammer receives a big update, both touching up a lot of rules wordings but also bringing a rename from Imperial Army to Imperial Legion AND it should now have all of the Imperial guard units from Rogue Trader. Im sure I missed one.
The goal is to work through the army lists now covering each army in turn to bring them up to "RT" standards before moving on to 2e and then finally the 3e books. Along the way there will be decisions to make so as you should expect, not everything will translate exactly or 1-to-1.