On top of that, dragonborn now get a 1/long rest ability based on subtype at 5th level: immunity to a damage type for 1 minute for chromatic, 1 minute fly speed with hover for gem, and a secondary breath weapon that can cause 1 round of incapacitation or a 20 foot push and knock prone for metallic. All three of these seem really nice, and fairly on par with other racial features that grant one use of a spell (usually 2nd level) per long rest at 5th level. Gem dragonborn also get at-will telepathy, which is potentially very useful.
Verdict: A solid addition that makes dragonborn more appealing next to innate casting races like Tieflings and Drow.