Here's a brief overview of what's new:
Tiger Lake uses 10nm with a redesigned transistor (SuperFin) and capacitor design (Super MIM). It's rumored this combination offers "a full node" worth of performance uplift.
Intel is also working on 10nm Enhanced SuperFin for server processors.
Tiger Lake uses Willow Cove cores with 1.25MB L2 cache per core.
Control-Flow Enforcement technology to offer protection against return/jump oriented security vulnerabilities.
Willow Cove promises a 'dramatic' increase in frequency at lower voltages than Sunny Cove.
Up to 96 Xe-based execution units, the GPU offers 3.8MB of L3 cache.
Tiger Lake memory subsystem supports up to 86GB/s of bandwidth, support for LP4x-4267, DDR4-3200 and LP5-5400.
PCI Express 4.0, Thunderbolt 4, and USB4 support