Recently, a shortened recording of the Phineas and Ferb episode "Doof Dynasty" has surfaced on the Internet and even though it is not in English language just yet, it seems that fans were anxious to see it - and most likely for the anticipated P.I. business, which should be left to private investigators, by the way. The thing is, as fun as it is to get hopes up for Phineas and Isabella pairing up, time and time again I must stress that they put too much of their hopes on the line, so that when the great disappointment comes to pass, they will all be crushed and bummed out severely. Although, viewers who saw the episode, or the biggest chunks of it, have already expressed their delight over all the Phineas and Isabella stuff that apparently happens in the episode, which in my opinion I see as nothing special. This is, after all, another world, where anything is possible and does not stay true to the Phineas and Ferb storyline. So, canonically, the events of "Doof Dynasty" would be considered null and void, lest anyone can prove anything otherwise. Good day.