The PlayStation Vita TV (aka PlayStation TV) launched in Japan back in November 2013. Today, via AV Watch, Sony confirmed that it will cease shipping the hardware (in Japan, at least) at the end of February. That's today. According to AV Watch, the reason Sony gave is that, in Japan, while the PS Vita TV was originally designed as an easy way for people to play games on a home console, now, the PS Vita is doing well, as is the PS4. It sounds like the PlayStation TV isn't really needed any more.
The PlayStation Vita TV's official Japanese site states the microconsole is no longer being shipped (出荷完了 or shukka kanryou, which translates to "shipping has concluded" or "shipping has ended"). The PlayStation.com page does not mention anything.
What does this mean for the West? AV Watch also reports that Sony will no longer be pushing the PlayStation TV name outside the country. Kotaku reached out to Sony for clarification, but did not hear back prior to publication.
In case you missed it, here is Kotaku's review of the PlayStation TV (AKA PlayStation Vita TV), which launched in the West in 2014.