TL;DR Samsung has freshly revealed the Galaxy Z Fold 8, Z Fold 8 Ultra, and the Galaxy Flip 8 at an event in London. While AT&T, Verizon, and T-Mobile have opened pre-orders for the phones, in-store availability will begin on August 7. All carriers are offering steep discounts on the new foldables, in addition to the Galaxy Watch 9 and Galaxy Watch Ultra 2. AT&TPaul Jones / Android AuthorityStarting with the most-discussed foldable of the lot, AT&T is selling the Galaxy Z Fold 8 for $0 with an eligible trade-in and the Z Fold 8 Ultra at a $1,900 discount…