Problem: It appears as though the only HTML snippets that still work in ST2 are script_tag and style_tag, since they have an explicit tabTrigger. All others, like html and elementid don't work anymore, despite the fact that as far as I can tell the snippets themselves are unaltered from those in ST1.
Steps to reproduce: Create a blank .html document. Type html and press tab. This produces the word html followed by four spaces (or a tab, depending on your settings) rather than the expected document skeleton.
I haven't looked into this but I just figured they weren't built in. Aren't they just tied into Zencoding or the WebDeveloper packages? Might need to wait for those to get ported or setup some snippets of your own in the meantime.
I've doublechecked this and these snippets relied in regex-based keybindings. I took a quick glance, and I couldn't find any examples of regex-based keybindings in v2, so either they are not implemented or maybe the syntax has changed...
If you're going to be using a different mechanism anyway, my suggestion would be to bind a script to the tab key in the context of html and xml files that looks at the preceding characters. If it is a valid tag name (with optional attributes), such as body, div#menu or p.caption#caption1, it expands it to the tag. In all other cases, it inserts a tab. This has two advantages over the current approach: you no longer have to type everything in a short timeframe and you can use backspace if you make a mistake.