McDonald's unveiled the menu for CosMc's, a beverage-focused concept that could compete with Starbucks

• McDonald's revealed new details about its new restaurant concept CosMc's on Wednesday. 
• The restaurant concept menu includes customized cold drinks and sandwiches.
• The first of 10 stores opens this week near Chicago. 

Watch out, Starbucks. McDonald's is ready to launch its new beverage-focused concept, CosMc's , which promises to solve for "3 pm slump."