V2 TileOverlay => ?

[John Malpas]

My organization has made a few web applications
with GWT and the official Maps V2 library.
We also have made mobile/HTML5 apps with GWT,
but not yet with Maps.

I just went to a Google Earth Outreach program where the
presenters emphasized that the Maps V2 API was deprecated,
and that we all (developers in the audience) should switch
to Maps v3. After hearing that, I am hesitant to put much more effort
into GWT + Maps V2.

Over the past two days I have tried using this:
http://code.google.com/p/gwt-google-maps-v3/
in a new application. I did get it to work, but had
to stop when I came up against the lack of support for
(what were called in V2) TileOverlays. Our map
applications rely on a custom tile layer which appears
on top of the Google Map Type

Here is a concrete question: I am wondering if it
is worthwhile to keep going with
http://code.google.com/p/gwt-google-maps-v3/
and try to add the needed tile overlays with
JNDI and ImageMapType. Either that or,
again with JNDI, try to add a V3 KMLLayer
that duplicates the effect of the custom tile layer.
Other than that, at the moment I do not see a
migration path from Maps V2 to Maps V3
for our GWT applications.

Any advice appreciated.