Late to the party(again).
Another excellent read from David Mack(as if we expected anything else).
I was not at all surprised to hear of Data's potential return,as others have said,it was almost telegraphed during Nemesis
but Mr.Mack has done a great job,making it a plausible and emotional resurrection(no pun intended).
Personally I just don't have the mental energy to even contemplate reading about Janeway's return but I'm really looking forward to the next installment in Data's story.Perhaps a full return to active Starfleet duty might negate much of what David established about Soong's philosophy but surely Data wasn't revived to only make cameo appearances.
As for Worf(a character that I usually despise)David Mack actually made me feel that at long last Worf is changing,growing(through tragedy)into perhaps a more measured,understandable man.