Originally due to be released in March, the game has been pushed back until next month while the developers apply the finishing touches.
Promising that it will be worth the wait, a BBC spokesperson told Digital Spy: "The developers are just putting the finishing touches to the game as we speak, however the most up to date build will be available to trial at the Official Doctor Who Convention this weekend in Cardiff."
Doctor Who: The Eternity Clock is the first of three planned releases by BBC Worldwide, and will be a PlayStation timed exclusive in Europe before releasing on PC later in the year.
The Vita version will offer a number of unique features, including Near support and save sharing between platforms, which tied into Sony's vision of "console quality gaming" in the mobile space.
It will also feature split screen multiplayer, and will be supported with "self contained" downloadable content, which will arrive within a few months of its April release.
Featuring Matt Smith's Doctor and Alex Kingston's River Song, the game allows players to control the pair as they travel across time and space to save the Earth.
It will feature classic enemies such as Cybermen, Daleks, Silurians and The Silence.
Watch the latest Doctor Who: The Eternity Clock trailer below: