The Swallows posted an official announcement of the signing at the official site.
The contract appears to be a 2-year deal wroth 750M yen plus incentives. A third year option held by both sides could bump the total worth of the contract up to 1.42B yen.
It appears the Yakult Swallows were able to persuade Chang-Yong Lim to stay by giving him a 3-year deal that will probably be worth more than 1.4B yen. An announcement is likely to be made later today. The Swallows' exclusive negotiation window was set to expire on the 30th.