The general consensus was that Broadcom surprised a lot of people with their focus on the enterprise and their speed to market. At the time of writing this, all of the shipping enterprise 802.11ac access points are Broadcom chipsets in the enterprise space (Cisco, Aruba and Meru).
Atheros was the king of the enterprise AP market in 802.11n. With the exception of Cisco who is known for their Marvel chipsets, almost every enterprise class AP vendor used Atheros for their 11n chipsets. Now Broadcom is the first to market and a number of the enterprise manufacturers have made the jump to Broadcom due to a significant lead time of getting their gear to market.
But being early to market didn't come without a price. There are some restrictions around the number of encrypted clients, number of beam-formed clients and whether they support promiscuous packet capture.
I would expect to see vendors bringing their Atheros based chipsets to market soon. Xirrus passed around their 802.11ac module based on Qualcomm Atheros. I would expect to see a number of product announcement in the coming months and for the vendors to promote how they are different from their competitors products.
The real question is whether vendors who have jumped on the Broadcom bandwagon will continue to stay there, or if they will make the jump back to Atheros when those products become available. This will also help AP vendors help differentiate themselves from these early generation products. One thing you can bet on, it will be an exciting ride.