A new Member State, a new Commissioner. With the EU expanding to 28 Member States on 1st July, the Commission will also be adding a new member to its College. This is in line with the compromise struck with Ireland over the Lisbon Treaty, ensuring that each Member State will have one Commissioner.
The nominated Commissioner for Croatia is Neven Mimica, a member of the ruling Social Democrat Party in Zagreb and former minister for European Integration. Barroso plans to allocate the Consumer Protection portfolio to Mimica, so his European Parliamentary hearing will be before the Internal Market and Consumer Protection committee ("IMCO").
The hearing will take place in 1 hour (9:30-12:30 CET) and can be live streamed on the Parliament's website.
The European Parliament has put together a nice flowchart showing how Commissioners are appointed (outside of when the Commission as a whole is elected) here.