Erm... and what were you expecting, really? Anyway, at the moment there are no AM3+ boards out there. All the "bios update AM3+ compatible" hype is nothing more than a rumor. There's no way to tell if that would work and to what degree. For the record, AMD is not supporting this either.
If you think Asus would do more in this situation than Gigabyte, go ahead but I don't see it.