It is very likely that players can soon start buying mounts at level 30
Recently Blizzard put some changes up for testing on the PTR servers. The one that has many players talking is the change to the level at which you gain your mount. Blizzard is very likely to drop the level requirement from 40 to 30, and reduce the gold requirement to purchase one as well. Byron "Messiah" Mudry looks at this change in his editorial this week in an attempt to find out if this is a good or bad change for most players.
Next up on the list of negative effects is the potential trivialization of content. Don't forget that the content from level 30 to 40 was created with the thought that players would not have fast transportation available to them. Therefore part of the quest was actually getting there.
You can read all about it in the Editorial - Should Mounts be Available Earlier?