A "prelist" of updates apparently obtained by the mobile blog suggests that the soon-to-be-released Samsung Galaxy S4 will be joined by four other models to receive the forthcoming Android 5.0 OS, including various versions of the Samsung Galaxy S3, Galaxy Note 2, Galaxy Note 10.1 tablet, and the Galaxy Note 8.0 tablet. The Galaxy S4 and Galaxy Note 8.0 have yet to launch.
The prelist does spell out a number of Samsung models that may not see any updates beyond Android 4.2.2 Jelly Bean. Devices found on this particular list include the Samsung Galaxy S2, the Galaxy Note, and a variety of other models with limited market availability.
Other handsets which could be left behind are the Galaxy Ace, Galaxy S3 Mini, Galaxy Young, and Galaxy Premier. Most of these devices are not exactly powerhouses, but one might think that least the newer ones, like the Galaxy Grand Duos and Galaxy X Cover 2 might be eligible. However, since they're lower-end models, Android 5.0 could pass them by.
It is worth noting that this prelist has not been confirmed, and that things of this nature are subject to change. Google is expected to announce the next build of Android at Google I/O 2013, which takes place in May.