For the ones interested, GM Boris Alterman covered two variations of this fantasy variation in his gambit guide blog: http://www.chessclub.com/chessfm/index/alterman/index.html
(you need an account, but a free trial account is easily made)
Part one covers:
3... xe4
4. xe4 e5
5. Nf3
And how similar this play is to the King's gambit
Part two covers:
3. ... e6
4. Be3
One of the games he covered was this one with a double knight sacrifice