Really??? :
Way to make the game even less interesting.
They get rid of experience system (something, that I think must have been done many years ago) and give players ability to buy new things, instead of relying solely on the things that could be found in game. Considering that balancing never was a strong point in the last CV games, this feature will most likely allow access to some overpowered or useless weapon.
the experience system Castlevanias had its overpowered and 'useless' weapons as well.
By eliminating the experience system, they actually made this game's difficulty more challenging much
longer before obtaining the best stats/performance the best equipment out there can offer.
Otherwise, a leveling system would just cause players to boost really fast to kill the difficulty,
and that really is no better than players discovering better equipment earlier than other players.
All equipment have a limit to how much of a stat boost it offers, but raw level ups really makes
players lazier and sloppier since they have tons more raw HP/MP/stats to allow more room for error and spamming.
Level up bonuses combined with equipment bonuses, and multiply that with 6 player co-op,
and you risk a very unbalanced and easy game like SOTN and other level based CVs.
I'm not sure how hard the highest difficulty will be, but the game can preserve the difficulty much
better without a experience level system.
Also as for buying stuff compared to finding stuff, it is very likely the best stuff won't be available in the
shop and can only be found. A basic example would be SOTN. It's shop has useful items and some equipment that may be better than what you may have found so far, but some of the rarest stuff and things that can only be found in the castles themselves will naturally surpass anything the shop offers.
The shop is there to mostly provide some good stuff, but if players want better stuff they'll have to find it.