Am I correct in assuming that the I-Robot Create 2 does not have the 25-pin connector like the original version of I-Robot Create has? Thanks much...Rick
That is correct. The Create 2 uses the same iRobot-proprietary 7-pin serial connector as the 500-800 series Roombas (and possibly the 900 series as well - I haven't checked yet).
While there are third-party options for Create 2 cables, I always advocate first-party parts & accessories. iRobot's cable for the Create 2 is $30. I have one, and it is very well built and has the length for your robot to scurry around while you're interfaced with it. You also don't need to worry about messing with USB-to-serial drivers as you do with third-party cables, iRobot's is pretty plug-and-play - even with ROS on Ubuntu.
On a somewhat related tangent: Current scuttlebutt is that the Create 3 is not too far off from launch, and that it is likely to be based off of the 900 series Roombas (so a much more comprehensive sensor suite, much better battery, and built-in WiFi). But again, this is just rumor at the moment.