If you have seen the new Xbox Game Pass for PC service and are interested in getting the Ultimate package that encompasses the following:-
Xbox Game Pass
Xbox Game Pass for PC
Xbox Live Gold
Gears 5 Ultimate Edition (Available as released)
all for $1 for the first month, then please make sure that you are making the most of your purchase BEFORE upgrading your service to Ultimate.
If you already have say 6 months of Xbox Live Gold on your account and you then take advantage of the $1 for a month of Ultimate - you get a total of 7 months of Ultimate - after which you will be charged a monthly subscription for Ultimate. A nice saving.
This also applies to Xbox Game Pass months you already have on your account prior to upgrading for $1 Ultimate plan.
So if you have 6 months of Xbox Live Gold AND 5 months of Xbox Game Pass on your account - for $1 upgrade to ultimate you will get a total of 12 months of ultimate for $1.
So please make sure and stack those plans up BEFORE taking advantage of the $1 Ultimate upgrade offer (max 36 months) as you can not do this after you take up their $1 offer.