How does ubuntu update system work?

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http://askubuntu.com – Can someone tell me if every major LTS update inherits the features from normal ubuntu version?Meaning 12.04.2 inherited features from 12.10 and future 12.04.3 will get the features from 13.04?Or those features will be implemented into the future 14.04 LTS? I am liking the features of 13.04 and want to know that future 12.04.3 will get the nice features 13.04 version.Or I will need to upgrade to 13.04 to enjoy its features. (HowTos)