From their post:
It has been a good while coming, and we've put in many long hours, but now Treasury is ready for you to use on your touch phone or tablet! It was a surprisingly difficult task to design a single website that works across a wide spectrum of browser implementations, screen resolutions, and input mechanisms while keeping it suitably responsive for listing hundreds (and potentially thousands) of entries in a collection. We're pleased with the result, and we trust you will be, too.
We've tested on a number of mobile and tablet devices, and most tend to work well. But, admittedly, there are some quirks on some devices. However, I assure you we'll continue to iron out the wrinkles as best we can while supporting as many devices as possible. In the near future we'll be posting a web page that lists the browsers and devices we test on, so you can easily check if our websites are supposed to work on yours.
I know the big question many of you are asking now: when will Battleplan go mobile? Soon. Very soon. Work on it is well underway, and the code libraries developed for mobilizing Treasury will be reused in mobilizing Battleplan. In the mean time, be sure to get your collections entered!