Apple's mixed-reality headset will be primarily targeted at developers and could now see shipments of fewer than 100,000 units this year, Taiwanese research firm TrendForce reports. Apple headset concept by Marcus Kane TrendForce claims that the headset's high cost, difficulty to manufacture, and focus on developers will "restrict sales predominantly to pre-orders for this year." While Apple's headset could stimulate some new demand in the AR/VR product category, the high price tag of the device, believed to be in the ballpark of ~$3,000, will apparently pose a significant barrier to broader market growth. Trendforce forecasts that shipments of the new headset will now "fall short" of 100,000 units this year, with Apple potentially capping production at no more than 300,000…