There are presently at least 121 Vita releases scheduled for this year.
The Vita is far from dead, it just appeals to a different demographic than the 3DS. It gets a ton of indie ports, as well as considerable amount support from Japanese developers, so while it seems likely that Sony isn’t going to develop another handheld (at least not a conventional one) it isn’t really fair to say that Sony “dropped” the Vita. It’s more that Sony stopped dumping money into marketing it in the West where it failed to get as much traction.