I just got the email, too. I hadn't actually purchased anything from Sony's e-bookstore in years, as I do mostly library reading, and my smattering of purchases these days is from Kobo, Nook or Amazon, thanks to Alf.
Sony's store was a travesty for a long time (and was a clunky mess for the Mac anyway), and just when they got it semi-workable, they stopped selling the readers.
I am happy that Sony is making the effort to move customers to Kobo, but I'm guessing some money changed hands for that, just like B&N bought Borders lists.
I feel bad for the people in Canada who just bought T3s, but Kobo should do better by them than Sony ever did.
ETA: I'm reading the FAQ - sucks to be a 900/950 owner - the 3G will be cut off.
Not sure what I'll do when my T2 dies. My T1 is already sputtering, and my daughter's 350 seems to need constant charging (although she's been using it alot this month with all the snow days).