Guild Wars 2

With the expansion, has the maximum number of character slots per account increased from 8 to 9?

Or, if I buy the deluxe version, $25 up charge, will I still get an additional character slot? I already have 8.

The previous max was 64 slots. The current max is 67. Buying the deluxe version will give you 2 character slots as long as you buy before the expansion starts.

https://wiki.guildwars2.com/wiki/Character_Slot_Expansion
Core and HoT accounts begin with 5 usable character slots and free accounts begin with 2 usable character slots.
Prior to the pre-purchase announcement for Heart of Thorns, a single account could have up to 64 character slots.
However, the pre-purchase bonus grants one additional character slot, and the ability to buy another character slot with gems. Pushing its previous limit to 66 total character slots.¹
On July 10th, 2015, they increased the character slot limit to 67 because of the veteran player Heart of Thorns bonus character slot. This slot was free if you purchased Heart of Thorns on a older account, otherwise it can be purchased with gems.

There are people that have 12-15 characters. I myself have 12 slots. Not sure what the confusion is.

The maximum number of character slots is currently 67 according to GW2wiki.

Thank-you for the quick response..
I have not been paying enough attention to the changes that have occurred since I started, I missed the slot expansion.