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pre 2.0 wallet seeds will continue to be supported. They will be recognized by the number of words in the seed:
in version 2.0, the seed phrase will be hashed in order to generate the master public key.
thus, any phrase length will be supported.
However, in order to recognize seeds from version < 2, I plan to check if the number of words is 12.
so it's probably not a good idea to create 24 words seeds now.
So that means those who created 24 word seeds (by entering raw hex) would have to do a migration of all funds to the new style wallets? However, the legacy seeds will continue to be able to recover a wallet even if BIP39 is implemented? (due to the hashing of the seed)
I highly recommend implementing WarpWallet hashing (with salt) if the purpose of creating the hashed seed phrase is to better support brainwallets.