It is declared to be the intention of the General Assembly in enacting this article to provide a method for annexing to municipal corporations areas which meet the legislative standards established by Code Section 36-36-54. This article is not intended to affect or restrict the present authority of the General Assembly to legislate regarding the annexation of any area contiguous to any municipal corporation in this state, nor to limit in any way the authority of the General Assembly to provide alternative methods for extending municipal boundaries. This article shall not affect legislation pending on July 1, 1970.