This should definitely be the A01 revision. The A00 revision is from November 2014 and had some teething problems. Judging by the reviews (none before November 2015), this does not seem to be the case with this version, otherwise one or two users would have already complained about it:

Dell U3415W (34", 3440x1440)

However, to get a definitive answer, it is best to ask customer service directly by phone or email. The revision should be noted on the packaging.