I'm not entirely certain, but it appears that Henrik will continue to work on TORA, even while working for Quest Software, albeit under a new set of restrictions.
I'm not entirely clear what the relationship is with TOAD and TORA. Will TORA be Quest software's official product line on *nix? Will it eventually be replaced by a cross-platform TOAD? Who knows?
Update: Link fixed. Oh, and I forgot to mention that TORA appears to support MySQL, too.