I don't know why people are so surprised with this acquisition. Adobe has wanted a piece of the mobile development world for some time (look at the export to iOS they released not too long ago). They already have a decent suite of development tools and this will only make them stronger. A write once, deploy to all strategy is quite appealing, and if Adobe can manage to wrap it all up in to a nice piece of development software, they'd have a real winner on their hands.