Wait? What?! No.
The unified standard is being set by Valve, as they are the main distributor of games / software. Right now everybody is playing nice and nobody is really trying to be the different one (proprietary), which is more akin to IBM MicroChannel from back in the day.
Fact is, the industry isn't big enough for any hardware company to go in it alone. This is why all the games are supported across all the platforms. (mostly).
(this is to disagree with WolfShadow.)
To your question of BUY / WAIT.
What that comes down to is the release of the HTC Pro Model Kit with v2 Lighthouses and Controllers. News of developers getting the new controllers hit this week.
Now! Let's think about this... new controllers get to Devs, and then 6 months out to mass production. Just in time for Christmas.
If I was HTC and Valve, and wanted to release the HOTTEST TOY of the season, then you are looking at a Christmas release for HTC Pro Kit. Also at that time, they might also package the Wireless accessory as an add-on.
So, should you wait till December or 2019 to buy?
Well, consider that kit will cost you $+1,500 - +$2k if you want wireless. The current Vive Kit costs $500.
My opinion is purchase the Vive and have fun. By the time the next version gets released and if you REALLY want to upgrade then go for it! That stated, the current gen of Vive is going to be supported for a while even if they release the new hottness, because the new Vive doesn't really change the base experience or require anything else from the software.
Hope this helps, and may you enjoy VR! Right now Rec-Room Battle Royale has been very addictive, and my legs hurt from hiding in bushes trying to jump out at people with a shotgun.