Looking at the way EIGRP calculates bandwidth the formula looks like "10^7/interface(in kbps)". At 10Gb, the value derived from this calculation is 1 (if I didn't mess up my math). Now that 40GbE and 100GbE is here is there a way to adjust the 10^7 to something greater. This would be similar to changing OSPF's reference bandwidth.
In a presentation at Cisco Live yesterday the presenter stated that Cisco is working on this issue and that a fix for this will be released some time but was not specific how far out that would be. He stated that in the meantime if you want to adjust the delay on interfaces you can achieve the differentiation between the high bandwidth interfaces.