I would suggest you head over to www.allearsnet.com. Click on Accommodations. Scroll down to Pop Century. Click and taaaadaaaahhhh!
Tons of pictures of the entire resort.
We have had tubs with showers . The pictures above are for an "accessible room", so is apparently different. The allears site (referenced above) has pictures of the standard room tubs.
The Disney website (under Resorts, Value, Pop Century...) says "A limited amount of rooms with king-size beds are also available." Accessible rooms are listed separately.