It's very unlikely that Acer (or other prebuilt PC manufacturers that use proprietary motherboards) will provide a new BIOS that supports 13th gen CPUs. What would they gain by doing this? Nothing. Most likely they would only lose future sales by doing this.

GPU should be upgradable depending on the size of the new GPU and whether the PSU has enough power and has the needed cabling (see nvidia 40-series). As for AMD RX 7000 series GPUs, upgrading should be pretty easy because they look use two 8-pin PCIe power cables.

I believe the 12th and 13th gen of intel processor both use LGA1700 however i'm not sure if the Acer predator series would require a bios update, as the 13th gen are compatible with the previous gen - it's too expensive just to test without confirmation from Acer themselves. Dell and Alienware don't provide bios updates for previous gen motherboards to support the new processors , while it makes sense for profits as a business , it doesn't as a consumer and it's one of the primary reasons i left Alienware ( had the R13 ) and came to Acer predator as it has a lot more upgradability, in the R13 you can't even change the motherboard or power supply meaning you can't use the case if you want to change things out.

The po5-640 an po7-640 share the same case and from what i've seen the same mATX motherboard - differences between them come down to the AIO cooler on the 7000 vs the ARGB fan cooler on the 5000, power supply differences and the 7000 has a standing GPU on a riser cable using a baffle plate - From what i've seen with an aio cooler and riser/baffle combination a 5000 can be turned into a 7000, exactly the same. Going off that information i would say that you can easily switch the power supply and Graphics card on the 5000, the case has alot of room and i think even a rtx 4090 could fit if that's something anyone would want in the future.

The above shows why the acer predator line of gaming pc's are the best prebuilts, underated but stiill the best, as you can literally switch out everything , barring the 3000 series which seems to have proprietary motherboard.

Regarding the temps - A 240MM top mounted AIO should bring it down significantly , differences in temperatures on different games could be down to how much rendering and work the CPU needs to do, so some are more CPU intensive then others, the gaming mode is very loud a possible solution and one i'm using at the moment

Switched out the 120mm AIO fan for one these i had laying around and gaming mode isn't loud and the cooling is way better, the only reason i'm looking to switch to a 240mm AIO is mostly aesthetics although if i get even better temps i won't say no.

So for me i have a aio cooler so there's a pump on the cpu and pipes going to 120mm radiator which has a fan on it, i changed the fan on the radiator. This fan is of a lower RPM then stock but performs better due to the design, Noctua do make different cheaper fans, but they won't work aswell as this one, you could use the RGB fan, but that depends on if you want better thermals or looks.

I play MW2 4k@120fps with no drops at all, so that's where i've done my testing, intially my cpu was going up to over 90 degrees , that's a core i9 12900k which are known to run hot, now same settings the max peak is around 70 degrees on the processor with just a fan change, and signaficantly less noise, so its perfectly usable like this.