Possible Projects

Magento 2 Code Review? (Damian)
Backend: use Flat Tables (Damian)
Backend: control Grids via XML (Damian)
Backend: Testing your Layout XML (Ivan)
Backend: Emulation of third-party service (Ivan)
Backend: Using the power of DDL and Varien_Db (Ivan)
Backend: Migration of data between live-semilive-development (Ivan)
Backend: Copy all Attribute-Translation when a new store is created (Fabian)
Backend: Pay per tweet (Fabian)
Backend: Get discount for a tweet (Fabian)
Backend: Multiple stocks for one product. (Karl)
Payment modules: automatic fraud detection/prevention (Bastian)
Sales: Scale the possible number of orders per minute by migrating the Order-Transactions to a NoSQL DB (MongoDB?) and use a queue to synchronize them with the standard DB. Proof of concept might be enough. (Vinai)
ImportExport: Implement a catalog_category entity type adapter for the ImportExport module (Vinai)
Open source CE FPC Solution (Daniel Sloof)
What templates are really used in your theme? How to clean up. (Karl)