Nothing has been officially announced yet unfortunately. As always though news and updates will be posted to http://newsroom.sprint.com/news/
Sprint will have a release party this coming week with HTC in NY on the 5th of April. So I would look for it to be announced then, I see the Jet being announced along with some other sweet ones..
The Sprint variation of the One X is being announced tomorrow, however it is the dual-core version of the phone which is a good thing considering the dual-core S4 outperforms and uses less battery than the quad-core Tegra 3 version. I'm not even sure why they bothered making the Tegra 3 version since it's not as good. Perhaps the chips cost less and it doesn't make since to pay more for areas that don't have LTE.
There was supposedly a conference about the HTC Jet... Sprint's version of the One, on April 4th 2012, but I can't find any info for it. All threads and external websites I can find end before the 4th. Does anyone know if the Jet is still coming to Sprint on June 10th?
The Jet was announced on April 4th as the HTC EVO 4G LTE. Pre-orders for it start on May 7th.