What do you call someone who is able to learn the new technologies?

George is highly enthusiastic and adaptable with the latest technologies and advancements.

Adaptable: able to change or be changed in order to fit or work better in some situation or for some purpose : able to adapt or be adapted.

It may not be the most precise answer as it relates more closely to an understanding of existing technologies, but tech-savvy makes some implication that a person would be capable of learning new technologies as well, and it's perhaps the most apt single-word choice.

George is tech-savvy, because he knows the concepts well.

You could consider using early adopter if you want to emphasize the fact that George is able and eager to learn new technologies before they become widely available. Early adopters are usually tech-savvy.

a person who uses a new product or technology before it becomes widely known or used.

[Dictionary.com]

An individual or business who uses a new product or technology before others. An early adopter is likely to pay more for the product than later adopters, but accepts this premium if using the product improves efficiency, reduces cost, increases market penetration or simply raises the early adopter's social status.

[Investopedia.com]

The best example can be the word to be inclined.

Oxford English Dictionary has the possible answers for it.

inclined - have a specified disposition or talent

George is inclined to learn state-of-art technologies, because he knows concepts well

George is technologically inclined, so he can learn state-of-art technologies easily.