The new plugin is amazing and loaded with great features. However the XML sitemap part is quite basic. Coming from the Google XML sitemaps plugin at least these features are needed:
1. Option to add urls manually. This is needed if some page of the site is outside WordPress or if you want to exclude pages except for one or two.
2. Option to set the priorities manually per url type (post, page, category etc). For example on my site category pages are really important but the priority is set to low automatically.
One extra thing that is missing from all sitemap plugins: Could it be possible to have only one sitemap for the whole network? This way I can control the whole network in Webmaster tools since it's time wise impossible to add sitemaps there for each sub blog separately.