what does the word "gel" mean here?

[Serge_HID]

"I'll also summarize (drum roll please) which major features the committee decided to put in C++0x and the features that didn't make the cut. In the coming months, I'll go into more detail about these major features as they gel. "

[Serge_HID]

to gel=to appear?

[Mike]

Gel is a harden liquid substance. Like a jello, so to speak. "As they come together become more solid". Meaning less and less changes needing to be made to the product for it to take shape.