Cortana will be available in the United Kingdom and in China “very soon,” which Ash translated to mean a matter of weeks, not months.
While a welcome development, it will probably not change Cortana’s “beta” status, rather, simply widening native reach so more developers and enthusiasts can take advantage of everything Windows Phone 8.1 has to offer.
When the developer preview of Windows Phone 8.1 was launched, Cortana was restricted to the US market only. There are workarounds to that situation, but there is obviously no support yet for Cortana to start understanding other languages or accents.
We have no official time line for how many weeks Ash means, we can always hope for something before the end of June, or early July.