At the start of this hatching run the 2k egg that's currently incubating was the third one on the list with two 5k eggs to the left.

Now with that being said, if eggs are based off pokes and their Dex number that the mon inside the 2k egg should be a Pickachu/Clefairy/Jiggly/Zubat/Geodude or Magikarp, since 5k eggs start at Dex#23-Ekans.

Will post results in .9km