major version upgrades that might break production servers as is in this case of 2.0.0 should be done manually

i see that mongo-* 1.8.3 rpm were renamed to mongo18-* and 2.0 was introduced as mongo-* which resulted in auto upgrade to new version on my servers.

i would advise to release new version as mongo20-, mongo22- and keep old as mongo18-*, no renaming.