Walker and Biyombo, who both came into the league in the 2011 draft class, are now under contract for the 2014-15 season. Walker's is for about $3.5 million and Biyombo's is worth a little under $4.1 million.
Kidd-Gilchrist followed in 2012 and will earn around $5.02 mill next season. Noticeably Bonnell didn't mention Taylor, whose option was only $915,243, as HoopsHype indicates.
These contract options were anticipated by many. Walker's performance last season and prospective performance this season is well above the value the option is worth and Biyombo's value as a big man with elite shot-blocking skills (which is inflated by the NBA's natural inflation of big men value) is worth perhaps a bit more than $4 million.
As for Kidd-Gilchrist, $5 million is probably approaching the value of a limited offensive option, as good as his defense is. If his jump shot improves his consistency outside of 8 feet, wonderful. But otherwise, one has to think where his financial value is. He's still quite young and talented, so it's not like he's completely devoid of offensive skill.
Comparatively speaking, these are still easily-handled contracts with potential for the Bobcats, so it's kind of whatever, but their development is instrumental for the team's future.