If you file as-is, then you will certainly have to file an amended return later on down the road to account for the error in reporting your HSA contributions.
If you file an extension, then when the W-2C comes, you can file your original return without any additional fuss.
Under the circumstances, if you don't owe anything with your original return, then the latter alternative would seem the simplest - the least amount of work by you and by the IRS.
But if you owe money, then you might as well file your return as-is, pay the tax due, then get prepared to file the amended return in a month or two (although I hope the W-2C comes faster than that).
Forget the 4852 - the IRS does have a copy of your W-2, just not the corrected one. Besides, the process for 4852 involves the IRS calling your employer for the corrected W-2; but your employer is not the problem.
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