Porting Xorcom servers to Elastix 2.0 is definitely in our roadmap. We are currently waiting for the release of Dahdi 2.4 for Elastix (expected to be released in 1-2 weeks by PaloSanto) and for the Elastix 1.6 to Elastix 2.0 upgrade tool.
We have tested a beta version of this upgrade tool. We discovered some issues, which we reported to PaloSanto, and now are waiting for a new version, which we expect to receive shortly.
So, although there is currently no way to update Xorcom servers to Elastix 2.0, there should be soon! As soon as it becomes relevant, we will publish the news as an alert in our RSS feed: http://www.xorcom.com/xorcom.rss and here in our blog.