The grease function kinda reminds me of WTB's "Grease Guard" and Manitou's efforts back in the early-mid 90s to everything from headsets to forks. Hopefully King's efforts have created a less messy and more efficient maintenance solution. Gotta give them kudos for trying to use the bb as a fluid viscosity training device though!
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An available grease injection tool allows the bearings to be purged of existing grease and debris and new grease run through. What better way to maximize the life of your bearings than to do routine maintenance? Especially when it's this easy.
Racers take note! With the Chris King bottom bracket and injection tool, you can train day-to-day with a durable high-viscosity grease and race with a light, fast-rolling low-viscosity grease or oil. Imagine your current Friday night leg-shaving ritual finishing with a few minutes in the garage to get your bike as smooth as you are. Available in 10 colors."
Source:
Bottom Bracket | Chris King Precision Components