Well, you can expect a new Final Fantasy for the PS4, at the very least.
Things which suggest it's Versus rebranded;
- A few 'insiders' explicitly stated the game has been moved to PS4, and is dropping the XIII branding. Verendus has a ban bet that it will be there, he also claims Sony has some involvement with the game.
- Nomura himself has said the game is still in development but it's reveal has been delayed for reasons outside of his control, which will become clear (a platform shift?)
- Versus XIII as we know it uses elements of the Luminous engine (for lighting I believe?) which next-gen software will also use.
- Agito XIII was another FNC title which dropped the branding to become 'Type 0' so it's not an unprecedented notion.
- Nomura in interviews detailed the ambitious nature of the game, discussing the changes in concept (world map changes etc) which implies the game was pushing the hardware since its inception.
- Roen, clothing designer for Versus XIII dropped the Versus name from their website (despite having finished the work for the game in 2008) and had only 'Final Fantasy 15'.
- The official 'Noctis' fragrance has dropped the Versus branding (and is now named 'Noctis Final Fantasy') and is incidentally due to release 2 days after E3.
And as mentioned, Hashimoto at PS Meeting said a new FF will be at E3.