.24-18 wont appear in intrepid, it wont be uploaded.Infact .24-17 isnt in either.Devel versions use the kernel the previous distro ships with untill a build of the kernel thats going to be used in that version is available.(.26)
If you want the current .26 kernel avilable then have a look at the kernel teams ppa:
I expect a .26 kernel to appear soon in the repos.
Also you could have a look at the kernel teams git repo, to clone the repo then type that into a kernel: