All USB ports on the V support 5Gbps for USB protocol. However, Konstantinos posted earlier in this thread the various steppings in cable quality. The 3.0-spec cable supports up to 5Gbps but can only carry 15W of power. Since the V takes 27W to charge, this cable spec would be insufficient to safely charge the V (The V would probably charge as per normal, until the cable overheats and melts). The 3.1-spec cable supports up to 10Gbps, which is more data than the V can send or receive, but supports up to 100W, which is sufficient to safely charge the V. It's also the only one apparently labeled 'PD'.
In short: it seems the V will either come with a 3.1-spec cable that does everything, or one that has been cheaped out on by having couple fewer copper strands, allowing it to only send and receive power. The quality and materials being the same, I doubt that the charging+data cable costs more than a few cents extra to manufacture.
As for what data can be sent through the cable, think of it this way. I'm sure you have a couple of USB-A to USB-microB cables lying around. They may be for your phone, they may be for your external hard drive. They may be for any peripheral. It doesn't really matter what they came with, because they are interchangeable. So what if you phone manufacturer cheaped out to save a few cents, and the cable that came with your phone was charging only? You'd have a bunch of cables that you could use, re-use, repurpose, for any task. But you always have to make sure it's not that one, because that cable is completely useless for anything other than charging your phone.
USB-C is already a standard, and it will be more prominent. Your Eve V might be your first USB-C device, you may already have some. But unless you're pauliunas, you're likely to have more USB-C devices in the not-too-distant future. Would you really want to have to label all your cables, because some just work and some... don't?
Me, I prefer to get a proper cable!