Well we have to finish PlecoDict and our new handwriting recognizer first. And Palm OS' installed base is still far larger, plus Palm has a lower starting price point. You might also notice the mention in that article that a lot of Palm OS users are waiting for Cobalt - Microsoft just released a new version of Windows Mobile and Palm hasn't come out with a new OS in a year and a half, but Microsoft won't have another one for quite a while and Palm will in a few months.
Oh, and don't forget that Symbian OS devices outsold Palm OS and WinCE put together - Symbian is still currently #3 on our list of platforms to support, but if you want to go by pure market share numbers we're crazy not to put them ahead of Pocket PC.
To summarize: market share numbers are for our purposes virtually meaningless. But we should hopefully have a Pocket PC version out by the end of the year anyway.