Of course, you probably won't be able to take advantage of all that speed just yet, unless you have some insane pro-level kit, but that might change as the next wave of high-spec DSLRs dribble out into the market. When they do, these little guys should be able to cope with whatever ludicrous capture rates you can thrown at them.
When they go on sale, they'll be available in in 32GB, 64GB, 128GB and 256GB sizes. It's worth noting that you could theoretically fill up the smallest one in around a minute if you were so inclined. A minute.
You can probably expect an ever faster card to come along soon—these records don't stand for long—but until then, you'll have to save up for the Lexar. More here.