vapourware
noun /ˈveɪpəweə(r)/
/ˈveɪpərwer/
(US English vaporware)
[uncountable] (computing- a piece of software or other computer product that has been advertised but is not available to buy yet, either because it is only an idea or because it is still being written or designed
雾件（已做广告但尚未上市的计算机程序或产品）