R15

R15 is an animation rig currently in beta, which has more joints, and is able to bend. The model is named after the amount of body parts it has (15 parts) instead of 6, like the current model. The model is available to the public for testing. As the description of the game says, all the current animations are temporary, and thus will most likely be changed in the future.

Lua ports
There are scripts that try to remake the original model, including the animations, joints, etc, though all of them are now are pointless as R15 is released for all ROBLOXians.

Implementing R15 and scaling into a game
R15 seems to be already available for the public on ROBLOX. To enable R15, go to the Develop tab, look at the set of tabs at the left, and click Games. There, configure the game you wish, and you will be brought to the "Configure Game" menu. In Basic settings, R6/R15 selections will be present also for scaling.

Broken features
Currently, some hats aren't offset correctly on the avatar. Not all gears work. ROBLOX is currently converting all of the hats and gears to work with R15. However, with over 12,000 hats currently in the catalog, it does not seem likely that every Hat will be optimized for use with R15.

Backlash
Many users did not respond well to R15, for a different number of reasons. A small portion of these users thought it would make ROBLOX harder to run on old systems, however; for most this was not much of a problem.

Many people feel that the animation is awkward, ugly, and does not suit ROBLOX well. Others fear that this is a step in the wrong direction for ROBLOX, and eventually it will be completely developer-centered. Many users took to the Forums to voice their complaints and rants. However, R15 is completely optional, with the exception of games that are R15-only.

Some users gave positive reception to the animation, however, because of its bendable limbs. On the other hand, many testers gave negative reviews to the animation because the walking animation looks like "an angry 5-year-old stomping", to quote one user, and some think the cheering, laughing, and waving animations are over-exaggerated and awkward. It was also criticized for the joints being too visible,  Since October 2016 ,  and some catalog items appearing to not work properly. Some users even believe it will be used by  online daters.

Scaling
Scaling was released on November 17, 2016. It allows you to scale your ROBLOXian's width and height. Game developers can set whether the scaling is user choice or normal.

Trivia

 * If someone goes to the fonts folder he/she will find files named "characterR15.rbxm" and "characterR15_2.rbxm".
 * This is the first time ROBLOX is officially releasing a test of bendable limbs. In the past, bendable limbs were only in staged, pre-rendered promotional material and in a select few games.
 * R15 is sometimes thought to be one of the worst received new updates, along with the removal of tickets and the addition of BC-only places.
 * Some places gained access to R15 even before Beta testing for it was released, such as Trade Hangout.
 * R15 has been reported to cause numerous bugs in games, such as the chat not working for some users.