You don't say whether this is tape or P2, coming off a deck or via Firewire.
If it's P2 or Firewire, log-and-transfer as usual, then use Compressor to scale it up to 1080i and output as ProRes.
If it's coming off a deck and you have a Kona 3, capture as ProRes in 1080i.
If it's coming off a deck but you don't have a card that can upconvert, capture as ProRes 720p, then use Compressor to scale the Quicktimes up.