I want to know if these 2 perks stack their haste effects to know if other perks in the future will be able to stack haste as well.
02 Answers
Based on the wiki it looks like Hope and Adrenaline can't stack. Adrenaline is activated as soon as the last generator is completed while Hope isn't activated until an Exit Gate is opened.
Unless Hope activates once the hatch closes like Adrenaline does I don't think that these perks have a chance to stack, but if they do then they definitely can stack. You can use any other exhaustion perk and get a speed boost while Hope is activated and get both haste status effects as well.
1If what you are asking is if you can use both skills at the same time, the answer is yes, but ten in mind that it is only activated, once the exit doors are open.