the short answer is no, the current winplc is fixed at wince v2.12.
the no so short answer is that microsoft stopped wince development for the sh1 processor - which we use in the winplc - after wince v3.x, and they stopped supporting all headless platfrom development after wince v4.x. so, we're stuck with wince v2.12 on the current hardware platform.
your next question might be, 'well, are you going to make a new winplc that uses a cpu that wince v5 and later does support. i'm sorry to say, but, the answer is the same, no. we have no current plans to develop a new winplc, there simply has not been enough interest in the winplc for us to redesign the platform. that may change, and if it does, we'll be right on it, but if market interest stays the same, we'll continue selling the existing winplc hardware and using wince v2.12.