Apple has filed a response brief to Lodsys, who responded to Apple's intervention in the patent suit two weeks ago. Around the same time, the suit was expanded to include big-name iOS developers such as Rovio, EA, Atari, Take-Two Interactive and Square Enix. Lodsys has filed an opposition brief trying to convince the courts that Apple has no basis to intervene in Lodsys's patent suit against third-party iOS developers.
Florian Mueller of FOSS Patents says that Apple still wants a court hearing on the intervention motion. He's uploaded the brief