Should actually be on the top of their list, and should have actually been the first one to launch, since I believe the html client already existed on the previous site which had the same software.
HTML client essentially will allow all operating systems to play, whereas now its only limited to Windows.
SwC doesn't have the same software as Seals did. They bought a Windows client from Grid Poker. (Which is soooo far beyond Mavens it isn't remotely comparable.)
I think we're all in favor of having an HTML client as soon as possible, but I for one have no desire to go back to playing on Mavens. Give them the time to develop it.