Microsoft has released the Lync 2013 Cumulative Update 1. You can download the update here: Lync Server 2013 Cumulative Update KB 2809243
For an installation guidance, view this KB article: Updates for Lync 2013
With the new cumulative update coming from Microsoft, Lync 2013 will have a fantastic upgrade. With the CU1 (February 2013) , the most asked for feature by customers is finally coming.
When Lync 2010 came out we saw that Enterprise Voice grow rapidly, but some companies were still hesitant in adopting Lync. The feature that customers missed the most, was Call Pickup. With Lync 2013 CU1 coming, this will be a tremendous boost for the product.
For a more detailed process of how Call Pickup will work in Lync 2013, Matt Landis wrote a blog about Call Pickup setup.