The latest CTP from my team is now public on the web! Here are a few of the “M” language updates you’ll find in these bits:

• The ability to reference labeled entity instances in expressions and across compilation episodes.
• Entities and collections now support equality evaluations.
• One-to-many relationships no longer create a separate join table.
• Logical operators
• String concatenation with the + operator
• Member access in expressions
• Projectors
• .Count support
• Type conversions
• Right-hand side expressions in "M" grammars

You can find this list along with more info on the team blog and you can get the actual bits in the download center.