Google updates Mobile Sitemap format
As we have newly updated our mobile website and decided to resubmit the sitemap I have noticed an alert from Google

The Mobile sitemap uses the Sitemap protocol, along with a specific tag and an additional namespace requirement. A sample Mobile Sitemap containing listing a single entry is shown below.
<?xml version=”1.0″ encoding=”UTF-8″ ?>
<urlset xmlns=”http://www.sitemaps.org/schemas/sitemap/0.9″
xmlns:mobile=”http://www.google.com/schemas/sitemap-mobile/1.0″>
<url>
<loc>http://mobile.example.com/article100.html</loc>
<mobile:mobile/>
</url>
</urlset>
If you haven’t updated your mobile sitemap make sure you do it now.
Reference: Creating Mobile Sitemaps
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Hmmm..Nice info. But according to the Google webmaster help center page (http://www.google.com/support/webmasters/bin/answer.py?answer=34648&topic=8493), the new mobile sitemap format supports .wml .chtml & .xhtml file extensions in the same sitemap file and the format will be automatically detected. But when we try to submit this to Google webmaster tools and by selecting mobile sitemap, we are still asked to choose the format. Does this mean that, the new mobile sitemaps should be submitted as general sitemap? Please clarify. Thank you.
If it is in XML you have to choose format as Mobile for WML, xHTML, CHTML it would automatically detect as Mobile.