Useful link for me that confirmed the way to go, at least in the short term

http://vagabondrev.org/2011/03/23/37/

For me the pointer is:

"HTML 5 can provide an elegant, cost-effective solution to many cross-platform problems, and I counsel my clients to take a long, hard look at it as a first step in any assessment of their mobile application strategy."

So in the short term we´re going to be developing in HTML5, CSS and jQueryMobile for as much cross browser support as possible.