Dodged the bullet this morning...
I work from home full time - my work laptop (Linux) sits on the "L" wing of my desk with my retina MacBook Pro on the opposite wing.
This morning I went into my office, fired everything up, and proceeded to knock over a glass of diet soda/water from the previous night - directly on my rMBP keyboard. After about 4 seconds of pure panic (seemed like hours), I hit the power button to turn it off. I unplugged the power cord and began wiping up the liquid. Next step was to turn the opened MBP upside down on a clean dry towel to drain. I pulled out my toolkit and removed the 10 pentalobe screws holding the MBP back in place and remove it. I continued drying any moisture that I could see, and set the opened laptop right side up on another clean, dry towel. The glass couldn’t have contained more than a few ounces of liquid, but as I cleaned up the mess, it seemed like 3 or 4 gallons.
Fearing the absolute worst case, I called Apple to make an appointment with the Genius Bar at my local Apple store. After the initial clean up I didn’t notice any more liquid pooling or dripping out of my MBP, but knew better than to succumb to the temptation to turn it on "just to see if it worked". After about 7 hours, I pulled out a can of compressed air and began blowing around inside the notebook, to see if there was any more liquid. I didn’t find any.
I let it sit on the towel for another 3 hours - continuing to check for wet spots. None were found. As a precaution, I let my wife know that we may be looking at a big repair bill and/or replacement cost for my MBP. In the conversation with the Apple support tech, he advised that the main logic board could run as much as $1000, and then there was the keyboard, and possibly untold internal damage, including the 16GB of RAM and the 768GB SSD (yeah, I maxed out on the upgrades)... so realizing that any repair could easily challenge the replacement cost, I was willing to just let it sit for a while.
After a total of 10 hours of sitting and "draining", with no visual confirmation of liquid still inside the laptop, I put the back back on the MBP, held my breath and pushed the power button. Voila! Everything has been working perfectly since (going on 2 hours now).
And I immediately declared my office to be a "no open container" zone. Only cups and glases with water-tight tops will be allowed in there from this point forward. And now I’m off to purchase some lottery tickets before my luck changes.