Microsoft has announced the opening of AppHub submissions to the 23 new countries added to the pool of support. Developers in these countries (and beyond) will be able to submit their work to the localised Marketplaces, which will open up to consumers in the near future.
To recap on the newly added countries: Bahrain, Bulgaria, China, Costa Rica, Croatia, Estonia, Iceland, Iraq, Israel, Kazakhstan, Latvia, Lithuania, Qatar, Romania, Saudi Arabia, Slovakia, Slovenia, Thailand, Turkey, UAE, Ukraine, Venezuela, and Vietnam. The total number of supported markets is now at a respectable 63.
A quick reminder to developers - it's now reportedly taking more than 7 days to approve Marketplace submissions. Something to consider when keeping to announced release dates.
Source: Windows Phone Developer Blog