I picked one up for $1.49, which is the same price as a Jr. Roast Beef Sandwich.
Of Arby's new sliders, the Jalapeno Roast Beef is the only one that offers something new: the roasted jalapenos. Nibbling on one yielded a searing heat that was more than I expect from a jalapeno (I suspect it might vary from jalapeno to jalapeno though).
The cheese was thoroughly melted to form a mildly creamy blanket over the meat (it also provided a a bit of a cooling effect to offset the peppers).
I like the slider bun. It seemed the same as the ones found in the now-discontinued Mighty Minis. The bun is soft and squishy but resilient with a slight crustiness to the surface.
Nutritional Info - Arby's Jalapeno Roast Beef (98g)
Calories - 240 (from Fat - 90)
Fat - 11g (Saturated Fat - 4.5g)
Sodium - 670mg
Carbs - 21g (Sugar - 1g)
Protein - 14g