I'm using Gear with my Galasy S4 and already when i was on 4.2.2 i found Gear manager at Samsung Apps.but now with leaked firmware 4.3 all works like a charm.
To hit "Thanks" button is NOT dangerous!
My Android evolution:
PHONE: htc Dream => htc Hero => Moto Milestone => htc Desire => Galaxy S => Galaxy S2 => Galaxy Note => Galaxy S3 => Galaxy Note 2 => Galaxy S4
TABLET: Galaxy Tab => Asus Transformer => Galaxy Tab 10.1 => htc Flyer => Galaxy Tab 8.9 => Galaxy Tab 7.7 P6800 => Galaxy Note 10.1 => switched to Win8 tab: Asus VivoTab Smart => Microsoft Surface Pro 128Gb
WATCH: Galaxy Gear