Hi Fabrice,
We are currently in the process of reloading a huge volume of data (about 47 Go of zipped xml),
And wondering if we can safely do that in the 8.0 beta version.
Yes, you can safely do that. In 8.0, we plan to stick with the existing database format. Storage features like larger ID and namespaces ranges will be postponed to a later version.
Hope this helps, Christian