Apple has begun to change the denomination "iPad WiFi + 4G" to "iPad WiFi + Cellular", including the United States, United Kingdom, Australia, Canada and Hong Kong. In other countries such as Spain the original denomination is maintained.
Apparently this name change is a form of prevent further legal problems such as the one that occurred in Australia or the United Kingdom and in which the authorities of the country affirmed that Apple was misleading with the name "4G".
In the case of Australia, Apple was forced to change its marketing strategy and announce that the new iPad was not compatible with 4G networks the continent, in addition, had to return the money of all customers who complained for this reason.
In the case of Spain, the new iPad does not use the 4G connection but rather HSDPA or 3,5G, the best so far.
Source: Mac Stories