Novartis has begun shipping out their existing stock of Interceptor and Sentinel:
http://www.ah.novartis.us/newsroom/assets/pressReleases/NovartisAnimalHealth_PressRelease_2_2_12.pdf
From the press release it doesn't sound like they have actually gone back to production yet, though, so only existing stock is being shipped... no indications of how big that existing stock is so there may be another shortage again in the future. But for right now, it looks like folks should be able to get more of their Novartis drugs from their vet.
http://www.ah.novartis.us/newsroom/assets/pressReleases/NovartisAnimalHealth_PressRelease_2_2_12.pdf
From the press release it doesn't sound like they have actually gone back to production yet, though, so only existing stock is being shipped... no indications of how big that existing stock is so there may be another shortage again in the future. But for right now, it looks like folks should be able to get more of their Novartis drugs from their vet.