iGuidance 4.2, as already mentioned in another thread here, has been planned for late spring/early summer release depending on iNav's project schedule. It will be a minor release with a few new features plus new map.
It will be a welcome map update, because the current iGuidance 2009 (a.k.a. iGuidance 4.1) released back in July of 2008
Let's stay tuned as iNav Corp releases more details.