According to Blizzard, the answer is no. In a recent blog post, the developer stated that "progress made during the Diablo 4 beta will not carry over to the full game." This means that any loot, experience, or levels gained during the beta will not be carried over to the full game.
Blizzard's decision to not carry over progress from the beta to the full game is not uncommon in the gaming industry. Betas are meant to be a testing ground for the game, and as such, progress made during the beta is often wiped before the full game is released. This allows the developers to make any necessary changes and ensures that everyone starts the full game on equal footing.
While it may be disappointing for some players, this decision is ultimately for the best. It ensures that the full game is as balanced and fair as possible and that everyone starts with the same opportunities to progress. It also allows Blizzard to make any necessary changes based on feedback from the beta without worrying about how it will affect progress already made in the game.
It's important to note that while progress won't carry over, feedback from the beta will. Blizzard is actively encouraging players to provide feedback on the beta to help improve the game before its full release. This means that while progress may be wiped, players have the opportunity to have a significant impact on the final product.
In conclusion, while progress made during the Diablo 4 beta will not carry over to the full game, the beta is still an important opportunity for players to get a feel for the game and provide feedback to the developers. It's important to remember that betas are meant to be a testing ground, and as such, progress made during them is often wiped before the full game is released. So, enjoy the beta, have fun, and help make Diablo 4 the best game it can be!