"Tier demotions and shielding have been added
Once you enter a new tier, you’ll have a set number of games where you are invulnerable to dropping out
After you play these games, if you fall a full tier below your placement in terms of MMR, a demotion warning will appear in your profile (IE: A Gold V player playing at a Silver V skill level would see this warning)
Continuing to lose games at 0 LP will result in a demotion to division I of the next lower tier"
Quoted from Riot customer support on my question regarding dropping tiers in season 4.
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