Basic Attack has been removed from the game entirely.
The Beacon and Vanguard have been updated, partly as a consequence of the removal of Basic Attack. The level 1 Vanguard now starts with Smash, an at-will major attack that ignores the first point of physical protection your target has. Meanwhile, the Beacon's Lead by Example now grants the inspired
condition to nearby allies, instead of granting a +5 to attack. This takes the place of Battle Call, which has been removed.
The addition of Smash delays the Vanguard acquiring certain abilities, and the removal of Battle Call means the Beacon gets some abilities sooner.
More details on these changes, and an explanation for them, will be available in the blog