There aren't any specs for PC-2700. It isn't a standard, just a marketing tool. As I understand it, there won't be any point in going above 266MHz DDR* until two things happen:
1: There is an actual standard to make the products to. There is a comittee working on it but they don't seem to be making any progress. By the time they do, 333MHz will probably be history.
2: There are shipping products that can take advantage of it to deliver higher performance, in particular, CPUs. Unless and until AMD deliver a 333MHz FSB Athlon, the performance difference between an asynchronous 333MHz RAM clock and a synchronous 266MHz RAM clock will be in the same order as the difference between the asynchronous 133MHz RAM clock of the KX-133 and the 100MHz synchronous RAM clock of the AMD 750 - i.e., none to speak of. 133MHz RAM only started to make a significant difference once there was direct CPU support for it - in other words, the Athlon C with its 266MHz FSB.
Given AMD's existing R&D commitments, and the relatively small percentage speed difference between 266MHz and 333MHz, I doubt that they would see it as a priority.
Big statement on zero evidence follows: 333MHz DDR will be short-lived. The real step will be to a higher clocking, 400MHz perhaps, and PC-2700 will, at that time, only be remembered by people like me, who will lovingly plave a stick or two away to rest in peace alongside our 83MHz Cyrix 6x86MX chips and our 5.25 inch EDSI hard drives.
If it's the same price as PC-2100, sure, but don't waste any dollars on it.
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* I prefer that term - "PC-2100" is a dumb joke no better than the Rambus lies dressed up as marketing that prompted its invention.