No one will know much about the 2023 Highlander until Toyota announces anything.
As for the hybrid vs V6... it's all a matter of personal preference. The 3.5L V6 is a very good engine that has been around for quite a while... granted it's been updated pretty substantially over the years. The transmission with the V6 isn't problematic... but not everyone loves the way that it shifts. If possible, it might be a good idea to test drive one that's on the lot. The V6 is plenty powerful and gets decent mileage considering the size and weight of the vehicle.
The hybrid is a very different experience. It's not nearly as strong in terms of power but gets incredible fuel economy. Toyota's hybrid synergy drive system has been around for two decades- and it's generally a really reliable system. The current Highlander Hybrid is a bit different than previous versions... but given how hard Toyota works to make sure that their hybrid vehicles are reliable and durable... I wouldn't worry about long-term issues. The one issue that seems like it might be a consistent problem is with the fuel tank... it's really not a problem in terms of reliability... but lots of people have reported that the Highlander Hybrid won't let you completely fill the tank... which means that you might not get the advertised range between fill ups. If you search this forum- or the highlander hybrid forum- you'll find some info related to that issue.
Should you go through with the purchase of the 2022 Highlander Platinum or wait for the 2023...? That all depends on your priorities, how long you are willing to wait if you decide to reserve a 2023... and how much trouble your dealer will give you if you suddenly want to make changes. Normally I'd say that if you have waited for a specific custom order for a few months- you should just stick with the 2022... but given that it's a $50,000 vehicle... you should also make sure that you are going to get what you want.
To be perfectly honest, if the only thing that's drawing you to a 2023 Highlander is the idea of an updated infotainment system... if it were me I'd probably just stick with the 2022. No Toyota infotainment system is great. They come in horrible, bad, and acceptable in terms of infotainment interface. The one that's in a 2022 Highlander Platinum is what I would consider 'acceptable'. It's not great- but not horrible either. Given that Toyota has only been using that 12.3" display for a few years- and it's used in a few other Toyota and Lexus models... I wouldn't expect for Toyota to really mess with it too much for 2023. I would hope that Toyota would improve the base 8" infotainment interface a bit- but I'm doubtful that they will. The one feature that it would be nice if they offered with the refresh would be wireless Apple CarPlay and Android Auto. Right now the only Toyotas that have it are the Tundra with it's completely new system and the Supra- which actually uses a BMW system. I highly doubt that they will add that feature to the Highlander next year though- it's still a relatively new feature that most mainstream brands haven't gotten yet. Lexus doesn't even offer it yet on any of their vehicles- with the exception of the brand new LX600.