We plan to have WX shortly, though we don't have a firm timeframe yet. Compatibility with XM receivers is likely to happen, as is support for the FAA's ADS-B traffic/weather format (that most ADS-B devices output). We don't have any current plans to produce either of those classes of devices ourselves at the moment.
But basically, a Dynon transponder does ADS-B out. Then, with an ADS-B receiver (there's the NavWorx on the market now, with more products inevitably on the horizon over the next couple of years), you'll basically have the full ADS-B link for an affordable price.