On the pre-order page it looks like there are upgrade options offered in case you want to move from standard to deluxe or premium at a later time.  I can't seem to find a price on those upgrade options.  Anybody know?

Unknown publicly at this point as far as I'm aware. It's fair to assume it won't be less, therefore it's either going to be the equivalent or possibly a little bit more, although I would tend to think it would be the equivalent price just so people aren't outraged by such pricing.

I remember reading that the most economical way was to purchase the higher products off the shelf as it were rather than upgrading, so the upgrades will cost more than the equivalent increases in price between products.

Remember there’s clever marketing in play here.I’d still suggest it’s a wise move to purchase the base product or get the game pass and see what you think to the default aircraft and “hand crafted” airports before deciding if you think it’s worth upgrading for more of them. You may save a few dollars buying the upper products upfront rather than upgrading or you may think in hindsight you’ve wasted money, it all depends on your own opinion of the extras of course, which you won’t know until you see them.

 

 

Some of it might depend on whether or not you can cherry-pick elements of the fancier versions as single item DLC payware. If that does end up being the case, you might actually be better off getting a cheaper version of the base sim and only choosing the snazzier stuff that you genuinely want. Personally, I went for the super-duper version, but then again I always do with things like that.